CVE-2021-20123Draytek VigorConnect Path Traversal Vulnerability

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

7.5 HIGHEPSS 89.65%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:33 UTC

OverviewCVSS details

7.5HIGHCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Oct 13, 2021
Assigner: tenable

Affected

Draytek VigorConnect

Versions: 1.6.0-B3

Exploitation

Public exploit: Yes · 1 reference
CISA KEV: Listed · Sep 3, 2024
KEV due date: Sep 24, 2024
Ransomware use: Unknown
SSVC: Exploitation active · Automatable yes · Impact partial

EPSS · FIRST, scored Nov 7

89.65%chance of exploitation in 30 days

Higher than 99.79% of CVEs

CVSS 3.1 · NVD

7.5High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: None

CVSS 2.0 · NVD

7.8High

AV:N/AC:L/Au:N/C:C/I:N/A:N

Attack vector: Network
Attack complexity: Low
Authentication: None
Confidentiality impact: Complete
Integrity impact: None
Availability impact: None

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
7.5	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.8	HIGH	2.0NVD	AV:N/AC:L/Au:N/C:C/I:N/A:N

CISA required action

⚡ Known exploited · remediation due Sep 24, 2024

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Details

CVE ID: CVE-2021-20123
Status: Analyzed
Assigner (CNA): tenable
Published: Oct 13, 2021
Last modified: 2026-06-17 03:33 UTC
Weaknesses: CWE-22

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 13:03 UTC.